Upgraded the autopay functions and finished up the iframe.

ns_app/api/payments.py

@@ -97,6 +97,31 @@ def get_collect_checkout_url(invoice):
     )
 
 
+@frappe.whitelist(allow_guest=True)
+def crystalclear_webhook():
+    data = frappe.local.form_dict
+
+    # Validate success
+    if data.get("response") != "1":
+        return "ignored"
+
+    invoice = data.get("orderid")
+    amount = data.get("amount")
+    transaction_id = data.get("transactionid")
+
+    # Prevent duplicates
+    if frappe.db.exists("Payment Entry", {"reference_no": transaction_id}):
+        return "duplicate"
+
+    create_payment_entry(
+        invoice=invoice,
+        amount=amount,
+        transaction_id=transaction_id
+    )
+
+    return "ok"
+
+
 def create_payment_entry(invoice, amount, transaction_id=None):
     inv = frappe.get_doc("Sales Invoice", invoice)